Google's service appears to be suffering from the same problems Apple's iTunes Match went through when it launched in 2011 -- it too was mixing up clean and explicit versions of songs, according to The Verge.

Fortunately, if you've recently scanned and matched your music collection with Google Music there's a way to fix the problem.

You can do so by using the computer on which you installed the Music Manager software, which is what scans and matches your music. Go to your music library on Google Music and find the song that has been incorrectly tagged. Right click on it and choose "Fix incorrect match." That will tell the Music Manager software to simply upload the original version of your song and negate the incorrect match.

Unfortunately, there doesn't seem to be a way to correct multiple songs at once.